21642680

素因数分解:

$2^3\times 5^1\times {\mathrm{509}}^1\times {\mathrm{1063}}^1$

素因数の和:1583

約数の個数: 32

約数和(自身を含む): 48837600

約数和(自身を除く): 27194920

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 509, 1018, 1063, 2036, 2126, 2545, 4072, 4252, 5090, 5315, 8504, 10180, 10630, 20360, 21260, 42520, 541067, 1082134, 2164268, 2705335, 4328536, 5410670, 10821340, 21642680]

約数ペア:

[(1, 21642680), (2, 10821340), (4, 5410670), (5, 4328536), (8, 2705335), (10, 2164268), (20, 1082134), (40, 541067), (509, 42520), (1018, 21260), (1063, 20360), (2036, 10630), (2126, 10180), (2545, 8504), (4072, 5315), (4252, 5090)]